If you preorder at the 15$ level you get the game at end 2014 when the first release is ready

But I really can recommend to preorder the beta, because this community is awesome, which in combination with witnessing an awesome game like this being created is awesome², just don’t mention elephants!

In my opinion to play the game now in the current condition it will make not really fun for everyone.
I’ve already often experienced with Alpha games and many people complained about the condition of the game even though they knew that they playing an Alpha. So it is better to give the community the game when the biggest bugs and problems solved so everyone have fun while play